This sump can be used as a refugium or as a berlin style sump
Dual 4" diameter filter socks included
Dual perforated platforms
Top platform includes foam block
Bottom platform can be used for carbon bag, bio balls, etc
First section is 12 inches x 14.5 inches
Middle section is 12.25 inches x 14.5 inches
Last section is 8 inches x 14.5 inches